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分布式光纤温度传感技术及其应用 总被引:3,自引:0,他引:3
分布式光纤温度传感技术是一种用于实时测量空间温度场分布的传感技术。该技术利用光时域反射原理、激光喇曼光谱原理,经波分复用器、光电检测器等对采集的温度信息进行放大并将温度信息实时地计算出来,它能对光纤测线的温度场进行分布式的连续检测,是实现实时测量空间分布温度的一种新技术。本文介绍了该技术的测温原理以及其在南昌电网110 kV高压电缆隧道在线监测中的应用。 相似文献
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de Ridder R.M. Warhoff K. Driessen A. Lambeck P.V. Albers H. 《IEEE journal of selected topics in quantum electronics》1998,4(6):930-937
The refractive index of silicon oxynitride (SiON), a widely used material for integrated optics devices, can be chosen in a wide range between 1.45-2.0. We describe how the consequent large design freedom can be exploited on the one hand for a “standard” polarization independent optical channel waveguide having a favorable tradeoff between efficient fiberchip coupling and small bend radii (compact devices) and on the other hand for special-purpose and hybrid components where the refractive index should be finely adjusted for obtaining the desired functionality. We illustrate the applicability of SiON by describing a few devices for optical filtering in a new architecture for wavelength multiplexing, modulation, polarization splitting and second-harmonic generation 相似文献
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光路自动切换保护技术的原理和应用设想 总被引:3,自引:1,他引:3
随着光通信技术在电力系统通信领域的大量应用,如何提高光传输网络的生存性已经成为至关重要的问题。文章首先对目前已有的几种提高通信可靠性的方法进行了比较,认为光路自动切换保护技术和SDH自愈保护技术结合,会大大提升光传输网络的生存性能;重点介绍了光路自动切换保护技术的原理,提出了两种实现自动光切换的方法,即根据光监测模块的告警和SDH网管告警,给出了一个应用设想的实例。 相似文献
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采用热氧化法在晶体硅基底上生长SiO_2薄膜,研究了不同厚度的SiO_2氧化层对少子寿命(MCL)、光学吸收及与SiNx体钝化的影响;同时通过理论计算匹配相应的SiO_2/Si Nx叠层膜,得出SiO_2层厚度大约为10 nm,Si Nx膜的理论厚度在60~70 nm之间,折射率在2.1~2.2之间。研究发现SiO_2/Si Nx叠层膜工艺比常规Si Nx工艺太阳电池的能量转换效率(Eta)提升了0.12%,开路电压(Uoc)提高了2 mV,短路电流(Isc)提高了40 m A。 相似文献
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纳米多孔硅可控制备研究 总被引:1,自引:0,他引:1
采用了自制双槽和电化学腐蚀法在不同电阻率的硅片上制备出表面平整度很好的纳米多孔硅层,利用场发射扫描电子显微镜对多孔硅的微观形貌进行了分析表征。实验表明多孔硅的孔径、孔隙率和厚度随电化学腐蚀的电流密度和腐蚀时间增加而增加,且电解液中HF(40%)和无水乙醇(99.7%)的配比很趋近时,多孔硅的孔洞分布均匀性越好。在电阻率为0.01~0.02Ω·cm的P型硅片上制备的纳米多孔硅其效果相比其他电阻率的要好。 相似文献
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Since bulk silicon does not emit light in the visible part of the spectrum, the discovery of visible luminescence from porous silicon has been quite surprising and has generated significant interest. This material differs from bulk silicon in one important way, in that it consists of interconnected silicon nanostructures, having very large surface to volume ratios. The first emission mechanism proposed involved carrier recombination within quantum size silicon particles, but more recent work has shown that surface emission models may be more likely. The problems with the quantum confinement model will be discussed in view of current data, and an oxygen center luminescence model will be discussed, with supporting experimental data. A direct correlation between the presence of these centers and the red photoluminescence in both as-made and oxidized PSi will be presented 相似文献
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通过对我国首条110kV光电复合海底电缆应用情况的介绍,阐述了高电压等级光电复合海缆的关键技术和发展状况。着重论述国产化高电压等级光电复合海底电缆的结构和光电复合方式,分析其在深海抗侧压、防渗水等方面的研制工艺,比较了海底光纤和常规光纤在"余长"控制技术上的差异。展望了光电复合技术在电力系统通信领域发展趋势及应用前景,归纳总结光电复合技术在智能电网通信技术支撑体系中的重要作用。 相似文献
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RFID的技术原理及应用 总被引:4,自引:0,他引:4
本文详细介绍了无线电射频识别(RFID)技术及电子标签的基本工作原理及其分类,叙述了RFID技术的应用和前景,以RFID技术为主流的自动识别产业将得到更迅速更广泛的发展。 相似文献
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Darko Belavic Marko Hrovat Janez Holc Marina Santo Zarnik Marija Kosec Marko Pavlin 《Journal of Electroceramics》2007,19(4):363-368
Laminated 3D structures made using low-temperature co-fired ceramic (LTCC) technology are practical for ceramic micro-electro-mechanical
systems (C-MEMS). The sensors for mechanical quantities, and/or actuators, are fundamental parts of MEMS. Thick-film resistors
can be used to sense the mechanical deformations, and thick-film piezoelectric materials can be used as electro-mechanical
transducers in a C-MEMS structure. The integration of these thick-film materials on LTCC substrates is in some cases difficult
to realise due to interactions with the rather glassy LTCC substrates. The subject of our work is an investigation of thick-film
materials for electro-mechanical transducers (sensors and actuators) and their compatibility with LTCC substrates. Resistors
made with commercial thick-film resistor materials for use as sensors on LTCC substrates have been investigated and evaluated.
Ferroelectric ceramic materials based on solid solutions of lead zirconate titanate (PZT) with low firing temperatures around
850°C were developed for thick-film technology and evaluated on LTCC substrates. 相似文献
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分析了某供电局基于SDH光纤通信网存在的问题,以及多业务传输平台(MSTP)技术的实际应用,将155Mb/s光纤传输网升级至2.5Gb/s的原因、条件以及必要性和合理性。并就逐步升级的方案进行了优化。 相似文献
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Danz R. Elling B. Buchtemann A. Pinnow M. Korte E.-H. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2004,11(2):286-292
The fabrication and performance of sensors utilizing the piezoelectric properties of P(VDF/TrFE) copolymer thin films are described. The IR spectra of porous PTFE films, and electron micrographs showing their structure, are presented. Finally the fabrication and performance of a sensor utilizing the piezoelectric properties of a porous PTFE film in contact with a compact or normal PTFE film are described. 相似文献
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华北电网SDH光纤通道传输500 kV线路继电保护信号的应用 总被引:2,自引:1,他引:2
结合华北电网“丰—张—顺—迁”SDH光纤通道传输500kV线路保护信号的具体应用,说明SDH光纤通信系统完全可以满足保护信号的传输质量和传输时延的要求,可以作为继电保护信号可靠的传输通道。 相似文献